Help with homebrew hack plz

Ok. I followed a tutorial, and at first I could not even get the letterbomb to show up in my messages, but I deleted the files I had saved, and re-downloaded. The letterbomb now shows up, I get the scam warning screen, press one, it goes onto two other black screens and after I hit continue on the last one, the screen just turns black, and my wii flashes. I left it for 10 min, nothing. I know I DL'd the right version, 4.3U. What am I doing wrong?